---- Minecraft Crash Report ----
// Sorry :(

Time: 11:09 10/07/14
Description: Exception ticking world

java.lang.IllegalArgumentException: Cannot set property bck{name=facing, clazz=class ei, values=[down, up, north, south, west, east]} to null on block minecraft:piston_extension, it is not an allowed value
	at bbw.a(SourceFile:103)
	at bbn.b(SourceFile:208)
	at bbi.a(SourceFile:365)
	at bbi.a(SourceFile:152)
	at qg.a(SourceFile:853)
	at qg.aj(SourceFile:842)
	at qg.c(SourceFile:214)
	at net.minecraft.server.MinecraftServer.x(SourceFile:578)
	at pd.x(SourceFile:285)
	at net.minecraft.server.MinecraftServer.w(SourceFile:510)
	at net.minecraft.server.MinecraftServer.run(SourceFile:426)
	at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at bbw.a(SourceFile:103)
	at bbn.b(SourceFile:208)
	at bbi.a(SourceFile:365)
	at bbi.a(SourceFile:152)
	at qg.a(SourceFile:853)
	at qg.aj(SourceFile:842)
	at qg.c(SourceFile:214)

-- Affected level --
Details:
	Level name: world
	All players: 1 total; [qj['Oxygen25'/3, l='world', x=687.22, y=6.00, z=-395.72]]
	Chunk stats: ServerChunkCache: 1331 Drop: 0
	Level seed: 5017561408055231620
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options:
	Level spawn location: 676.00,4.00,-391.00 - World: (676,4,-391), Chunk: (at 4,0,9 in 42,-25; contains blocks 672,0,-400 to 687,255,-385), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
	Level time: 758 game time, 758 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 87588 (now: false), thunder time: 164833 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.x(SourceFile:578)
	at pd.x(SourceFile:285)
	at net.minecraft.server.MinecraftServer.w(SourceFile:510)
	at net.minecraft.server.MinecraftServer.run(SourceFile:426)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w28a
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.6.0_21, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Sun Microsystems Inc.
	Memory: 51042208 bytes (48 MB) / 117678080 bytes (112 MB) up to 259522560 bytes (247 MB)
	JVM Flags: 0 total;
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 1 / 20; [qj['Oxygen25'/3, l='world', x=687.22, y=6.00, z=-395.72]]
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)